1 error[E0004]: non-exhaustive patterns: `C(QA)` not covered
2 --> $DIR/issue-40221.rs:11:11
11 | ^^^^^ pattern `C(QA)` not covered
13 = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
14 = note: the matched value is of type `P`
16 error: aborting due to previous error
18 For more information about this error, try `rustc --explain E0004`.